minor #10525 [HttpKernel] Clean KernelInterface docblocks (sbward)

This PR was submitted for the 2.3-dev branch but it was merged into the 2.3 branch instead (closes #10525).

Discussion
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[HttpKernel] Clean KernelInterface docblocks

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets |
| License       | MIT
| Doc PR        |

- Fixed questionable grammar
- Added missing periods to make it consistent

Commits
-------

4b1f050 Clean KernelInterface docblocks

src/Symfony/Component/HttpKernel/KernelInterface.php

@@ -27,7 +27,7 @@ use Symfony\Component\Config\Loader\LoaderInterface;
 interface KernelInterface extends HttpKernelInterface, \Serializable
 {
     /**
-     * Returns an array of bundles to registers.
+     * Returns an array of bundles to register.
      *
      * @return BundleInterface[] An array of bundle instances.
      *
@@ -36,7 +36,7 @@ interface KernelInterface extends HttpKernelInterface, \Serializable
     public function registerBundles();
 
     /**
-     * Loads the container configuration
+     * Loads the container configuration.
      *
      * @param LoaderInterface $loader A LoaderInterface instance
      *
@@ -125,7 +125,7 @@ interface KernelInterface extends HttpKernelInterface, \Serializable
     public function locateResource($name, $dir = null, $first = true);
 
     /**
-     * Gets the name of the kernel
+     * Gets the name of the kernel.
      *
      * @return string The kernel name
      *